Low-Temperature-Toughened Polypropylene Blends with Highly Packed Elastomeric Domains AITranslate

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DOI：https://doi.org/10.1021/acsapm.2c01221

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Despite its versatility, the use of polypropylene (PP) has been limited to subzero temperature applications owing to its inherent brittleness at low temperatures. Herein, we introduce a PP ternary blend toughened by tailoring the domains of ethylene-propylene rubber (EPR) and poly(ethylene-co-octene) (EOC) within a PP matrix. The PP ternary blend was fabricated by melt-blending a PP and EOC binary mixture; a PP copolymer (PPC) was used as an additive. The Izod impact strength of the PP ternary blends dramatically increased between −50–20 °C compared to that of the iPP/EOC binary blend. Particularly, PP ternary blends with specific compositions exhibited impact strengths above 70 kJ/m2 even at −40 °C. The retraction rate of these blends was similar to that of high-performance specialty rubbers. Moreover, the blends exhibited a low brittleness temperature of −72.9 °C and, hence, may replace the expensive rubber products currently used for various low-temperature applications.